That is, if I can leave comments on X and that comment exists outside of the Google Plus infrastructure? Or what about: if you can sync your LinkedIn and Faceb

That is, if I can leave comments on X and that comment exists outside of the Google Plus infrastructure? Or what about: if you can sync your LinkedIn and Facebook address books in GMail. Microsoft's mail services offer that feature and it is very handy. I have always assumed that GMail doesn't, because Google wants to push Google+. In other words, Google+ is blocking progress in GMail. Another such example is Hangouts. Hangouts in itself is quite good. However, you get a severely limited version of Hangouts if you do not have a Google+ profile. E.g. you cannot add photos to a conversation on Android without G+ or initiate group conversations. Again, Google+ is blocking progress Hangouts, which could be of great use in business, but most companies probably don't want to enable Google+ in their Google Apps.